feat: Relaxed MMS caption length to 3000, can set RCS category, and new WhatsApp pricing info can be deserialized

[dragonmantank]

• MMS caption length increased on 3000
• Added new RCS param for messages to set the category
• Added additional whatsapp information for deserializing incoming messages that contain pricing.

Contribution Checklist

• Unit tests!
• Updated CHANGELOG.md
• My name is in CONTRIBUTORS.md

[codecov-commenter]

Codecov Report

❌ Patch coverage is 23.52941% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.70%. Comparing base (74690ca) to head (d36ba9d).

Files with missing lines	Patch %	Lines
...java/com/vonage/client/messages/MessageStatus.java	0.00%	5 Missing ⚠️
.../main/java/com/vonage/client/messages/rcs/Rcs.java	0.00%	5 Missing ⚠️
...ava/com/vonage/client/messages/rcs/RcsRequest.java	40.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #605      +/-   ##
============================================
- Coverage     99.87%   99.70%   -0.18%     
- Complexity     3425     3426       +1     
============================================
  Files           516      517       +1     
  Lines          7381     7396      +15     
  Branches        413      413              
============================================
+ Hits           7372     7374       +2     
- Misses            3       16      +13     
  Partials          6        6              

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